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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f6948cbe2ef3c1335f778a348d1e2c92e5dd7d52e75ad438f8d7b211c5cb19' 
  AND token = 'rJKgJ/PaBtuPTsqt9zgw2t0/tw9dW8imACIJ89/mRPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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