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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f06830226cfab5cc270b0bc8bdfdeca383ae29c73343d84240ed0f6b70a9ab4' 
  AND token = '0lsCtz7O4guZzQ+DVQ/nE/6EwoBhNbUU1F7oZ31d4SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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