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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d3751bc45fc375d985e15a121eeaf9fb14b71e97514d96b8d57e5b78b4f74e' 
  AND token = 'hhbw0wr22dTHcP8L1YMvv1r+Jbqqn41A8v/8s223flY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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