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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b238f72bff7627c24af19a02fca5388f04b5b799aa203321b7c56aa986d6b4' 
  AND token = 'cfJmEuAXo1mlSgYlCykR5TUhVa4kbluZu6UamFWiD1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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