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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5a9d92965fe001b9fb4ab8ce48f04db3c07bd0872ab7e6f4097d0dfea0adee' 
  AND token = 'eyeIGTqkG2hqb/pSdbYM13ncUNgfXw2y7/t4Ry6Alpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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