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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd13d2b38e128cb333b0495515a28a8804e62bb807c934c4371b6f58d9ef0ca' 
  AND token = '/NjjFaEBdYmKE29g7SXGB77LAFQJMJQnnSB0E3uWeLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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