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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35aab82ac672c344507d783bdb832784e0f3c025fce4b2fd3f0212924b211883' 
  AND token = 'pIx3QesdxkrCooqO/LBcPzb2hPG8oW01XW/IGgijUEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}