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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb0d13b46840db97857ce5a2e50f017304dcfc7dc5c575a8fe3632db4870835' 
  AND token = 'QUa5UEYq0/X+xnNbOgvx0HSO3E23WZQmjOAF8P4xwTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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