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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb914f0364408d018d33a78b8fa2d8c5bd9cbdda21e22d01e37702ef78c6613' 
  AND token = 'E2UrMuvZefSkc0G3Y7prJ7C9p8LPvqqrNdTT4Jy3doc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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