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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863dbe720283c5903a501150db19e885820c10f62b79a8898c2733db1db239b8' 
  AND token = 'gxkKj5e5fMImcSBxjL0gESJNXGOA1wwES79y7frJZvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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