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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f71050fc71fa87ecf5336f6d65ddee07f29cd17e5e60784deeb0cc3170e560' 
  AND token = '5HbbmXCQK0u016wgU/xQ5Ej6rFFqChO129HLN+FC49o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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