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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d30eaf0c707df008d0a0309febe6b051f5fc6c366d812fe83a54dcc5740448' 
  AND token = 't8EEUfjVRwYQuFEA9zC8dIGuBM19OZ1HKgEv0tkCZas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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