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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fe23f1fdbd9ff9ffdf45fd9b361aaff5867938434996be306b600d81bfa6d1' 
  AND token = 'TGjM6MOSsP5/yEdIOFLBruNnRQl5JJELy+TG8DNFguw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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