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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865b8b62967e2d2e461923166be7ac7a232c88b349c799707f9ed5059049ee9e' 
  AND token = '2TooWu0UdOk2bJjJ3lawmAKHvW+N96roIzAbK+j82kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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