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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9b9c1d6e219ad25462b9893037977d8e0c4c122b27e740f9f5fb25b775ba3a' 
  AND token = 'vd4j0Fg6wth5cRJdEdo4x1k6t76Q8SLsCcRuod9WKx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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