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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e5590ec1b15f94eebfd8bf7c58a13785a6ff5717cc0c2654402e7f366ebc39' 
  AND token = 'kVD9ItNkB1bfWZnE5OA6cnjvi84zCBGSB6R/vhFM7XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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