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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb954488bfe4f9c765b07f5a3e540eb5f977b14a5920aed1ba301813ca13f37' 
  AND token = 'wLH2dVD5LJL0rrNJJBn957hl9hV+7rmGvteatWIeI2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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