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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7794f04976d99c2c5c4be68a9db94c4ab3ad0b0b0a0f7f8eb71dc4f957baad13' 
  AND token = 'ACSJWe3LZcq6lcsZBJa5JVVxiLGE89LYCsXZKuvrV9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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