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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8281710dc0042cd1ae5800a69bad67caad0eeb54e7487d7e7181649612484c' 
  AND token = 'F0unLvoweqwtrJ23DYVhgZV6RP+mrMcX843ZbkXHCAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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