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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4ec4d15d350cf9919782ec597a6088f6806ca9d29c5e1559546a54a1332e55' 
  AND token = '0UZ89xJIFkkj5a/AJhrRWGY6jbmm+t+cuL0nAWakiKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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