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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bc647a1f7b41fbfd107c9aac26c2413510dd362c3a969ada90b80138531553' 
  AND token = 'iDR3EMQlMKNx2oibIlNG4SmihYIj2BBFexlu/Al+8wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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