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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d202194d92b4b7a1731880c21487dc03cc5743dc6c9383f87c5d86e3e92d7ec' 
  AND token = 'a3lW6mytNhtJrYtWmW11Xy6evE/aVbcWlv9oo/7YY5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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