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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabb8ace460a8c76e0cc9ff519425b5cea5cf5df2ced762bb48a6caf4cd155b9' 
  AND token = 'Z3CpSfZZ0AYi6e3upA+2nFyyCbsanX5m7j57MY/9Aqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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