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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b8392bc2dae49ccfecdd080673d1181dd9695a032f6a4b8207d7ae7b3acbf5' 
  AND token = 'L07V3rr3EYxWKZykGe3dbKEXP3w5wMWGyOOcDwaqpmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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