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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffeb0103e7acea2bb3ce00990fb69180972b5a0bb55eec6656da800ad645810a' 
  AND token = 'rkFJRKetkmm4Ww9J4jmDmUJFUTQJVO7EjFYEtJnJW4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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