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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532cb2d1213bb395d88cbbafafdf2f14f0ea9558c609ebb5fdc6263239661cc4' 
  AND token = '/8tZkKa519to4IiR8zg1/cvAFb3Qv1E1d2ExGyGA/Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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