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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436832d6a47d44ce4229fc84dc65a1c5abe70ee3a5beb4eeda1810468c767bb8' 
  AND token = 'CHFStqBhJ1kuinHsE1aVUzXWCLKj+bEhgpVoHngEyXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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