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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70806267848a8f805a7a36381dddc08ccce2d56d898e3ccfb90b2e519ead4dcf' 
  AND token = 'xS/n9qrTTRjTm+PHJtZQGyIFMRLPNu5KbaLcONtcvsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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