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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7fef8a608a6c9bfd94aa0d26f51101deb97fce749b85cc2d7c210cee1b1b8c' 
  AND token = 'Ep7n8BQ8v9JKACZilW2hQ+cQGvOE7vYlsRq9RCCbi3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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