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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa1ced3b48833271d587b0ed9183bdb7ef1a4fda48b515b1bbe031aa3a77a36' 
  AND token = '1whMYO535yvp80vZ52/8JunYUiJvQVAap3Owvy6zi3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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