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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee6573022fc4b579d7d9f275eaab638640e1c1f7906da2ef7af2e3bb7d6bfe7' 
  AND token = 'J/01GlbzCEuMR63xxkBWmUGtxXJtYRjBGCi0msViCT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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