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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c287b773179ced5e7c2f29c917ecd6b328880f91f6e0e1ee6100105a796578' 
  AND token = 'rNU+DssafvktsQEEf/hLv/jiRy8LleaQeg4q6V2m7RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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