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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef424049c7b237ad1ecd7ac4e3bc6d0cc71328353457ead9cc2a7f8c1590d2f4' 
  AND token = 'k40tzSEr6q5VxbJZm4jPQnS/+trEGK+V5l8fXadl6Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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