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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31777a5f2aa2786df2ed6fe87e11d5887c648b578c5fca0ab085325e86657723' 
  AND token = 'Yx9lJU9ZrakpjYC2bBJqdY9Q1caKd5UOt5U7lA/PPLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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