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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fa05c196b023f7e8f3ee97d4855490d32bb28e9ed3a1fd81c67f36d75ac06b' 
  AND token = 'TdoJhJSjjcR+dO28+fx+bA6OTEIEfnpL/N0z3meDPgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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