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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1cbb98081d8c26276ca6eae379347a852d15bc0683d8fde53a53597d1a2ef28' 
  AND token = 'wAlKRksaDr2YYSJbzfqu+bIgDOAaAz6/lX3UlnmE1OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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