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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7306a1aed215c679c0b0a812144253b37d05d0fc18f6e5dfbc8f5b04c139d1df' 
  AND token = '6cF2m3jRnB1VtczFugvPkB/ZE0d/JYNCfxD69mZ9V10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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