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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9c14a16c4b17ba13626117ef7e0c042e640ec859f119320c120ae7e5e14b9a' 
  AND token = 'fIHMAlA7YdzuRiw1z7G4wyGuRXo090zZxB8LSVX06Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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