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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66927c2b41cefb0078d109f385eaee062b302d0edd2d320f3a467fd391e8610b' 
  AND token = 'zGZDW6bUcA3j+AbFff15TZaN/o/mj+is0Ge4L05hJ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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