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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a8acf754c95fbc4620ac3f443f440ba25284bcd55df60b51095b8f70c7ffb7' 
  AND token = '1CwoBlK6nqrCucJgwI0vnNrlVuLDCZbo9bNRXPCved4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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