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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8640a039370c0d01cb87a0e8fc8b36604142a035e4ccd0b29ea99865c85f41c1' 
  AND token = 'VddLLfn5urrwR90SnOQ7kJ24Ppy86zDhThpBAUIICdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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