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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbeddfa07bb37c475a8c1a8ae4fb42cd4d3e1667f20c0ef5da43e0eb9f45d31' 
  AND token = 'i5InVw4dbfV4P5O3S8Pl0OzZZBebm0GEJNT1oI9vd8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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