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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeff20d76c3ec4ac7b896e0fa8ffeba95b031d4c69d1a93631de054fb4da9f5' 
  AND token = 'GZTxB8PVuusmBQ4NbgB0Osu6owHmnw9Jd9wSehrJ2HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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