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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcbd9732ae6af19b37cc941d89ff89945a6b4df752a6398abc8b24e1f7151e6' 
  AND token = '3H01xldhMXAA4tGWNj2ZVhNN7I+r6QFkeHupQ7RKA9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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