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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efb48d7a6a478ea2230b9e27498efbe20b94f6f16ddeedbf2d5fd9138ae0cae' 
  AND token = '2LgBE6gBrHpj0K1UrSiOoZoBpX6/T1yYPRLpcg4ac98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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