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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168b2b0241f4060771af80981750eae052c5dfa11993cb5553f02a8f57298e3e' 
  AND token = 'Dcd5S4FSVNyBRzqH2ohtjGtp7a9bZMfWW0wYlILAUfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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