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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee541567ad1f7ab5f614da0ad86ce414b4ded309190f17512f7a2199275f35b4' 
  AND token = 'cAjsfXDQmjDzkxQSbuAt+/hjvwWw8e/KDYUOm5a5vsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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