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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4120d9949cfee9f1641244f93d918afe0e6cf61b67986c9a6a1cebf7b87fd8e' 
  AND token = 'd/6Vgp0QeoRKx8Q1mOCtFZ79fUH1A+51f0QBQ2zIHAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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