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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd925be01777441a16fb1c134e5df408f4fc6968a7d0d6c05e2d52f3ad7772079' 
  AND token = 'rKQbvlFHbjTJurbYekSSB1EXEkPf9E3m0cUY/Ygm+z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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