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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d36988bbcf274f5eb4230fa5b22a0f1621c34cb2b5ddfbbd96ed404237bfea' 
  AND token = 'KT4uykLaMu0UsmohX/USqeIs4QSpL398eUvKfQ+aV94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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