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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06930abdf11bb58b76f47951ec0a749eaa8456ac40ef70e9d2498e8d6cf8db6' 
  AND token = 'vSxnSlLgZdhTRVJDpy2fD4mL/scnex/K7U7ibKXeyLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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