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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03268f61192e2ca2d0ad7cc99fb3a660f231ca34f9f5fc6e3f7bf7d61f55ad61' 
  AND token = 'MT5Ee+wA4jyuB9fBFG0OQA+A5Hdw1859cfNRztt76H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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